Sash lock



W. A. LAUFER AND A, KUFTA.

SASH LOCK. APPLICATION-FILED JUNE 15. |92

Patentedsept. 19, 1922.

WITNESS Patented Sept., iQ, i922.,

WILLIAM A. LAUFER AND ANDREW KUETA, OF PATERSON, NEW JERSEY.

SASH LOCK.

Application filed June 15,

Be it known that we, vWILLIAM A. LAUFER and ANDREW KUrrA, citizens of the United States, residing at Paterson, in the county of Passaic and State of New Jersey, haver invented certain new and useful lmprovements in Sash Locks, of which the following is a specification.

rllhis invention relates to sash locks and particularly to sash locks of the class in which the parts are secured upon the top surfaces of the meeting-rails of the two sashes, and its principal object is to provide a sash-lock which will automatically lock the two sashes when, one being already fully closed, the other is moved to the fully closed position, and which will furthermore be proof against unlocking except at the inside of the window or other opening closed by the sashes and by the means whichis provided for that purpose.

In the drawing, v

Figure 1 is a side elevation of the im# proved sash-lock, its parts being shown arranged on the meeting rails (appearing in section) of two sashes, one of which is partly open;

Figure 2 is a similar view, both sashes being in closed position and locked by the sash-lock;

Figure 3 is a vertical sectional view of the sash-lock;

Figures 4 and 5 are plan views of the main parts of the device; and

Figure 6 is an inside view of the part forming the member B.

a' designates thelower or inner sash and b the upper or outer sash of a window, a and b being respectively their upper and lower (that is to say, their meeting) rails.

On the top surfaces of these rails we secure the members A and B, the member A on the rail a and the member B on the rail 6'; we term the members A and B inner and outer members, respectively.

Member A includes a base-plate c and, upstanding therefrom, a pair of parallel standards d, whose upper ends overhang outwardly somewhat, that yis. toward the sash b when said member has been secured upon the rail a', as by screws passed through"l suitable holes in its base-plate and driven into said rail. In the preferred construction the outer edges of the standards are formed to rise approximately vertically for a suit- 1921. Serial No. 477,637.

able distance, as at f, and then pitch forward at an incline and being also'slightly convex, as at g, the purpose of which will appear hereinafter. In the upper ends of the standards is formed a pair of alined holes which are approximately, at least, alined with the vertical edge portions f of the standards. On a pin in these holes is fulcrumed a locking lever or pawl, the same including a hook c' which depends from the fulcrum of said` lever or pawl and an in wardly projecting operating arm or handle j which is long enough to project inward beyond the rail and is adapted to rest on the base-plate c. In the position of the pawl or lever shown in full lines in Figs. l to 3, where its arm or handle rests on the basei plate c, the front edge 7c of the shank of its said hook i is pitched upward and outward and the top edge Z of the catch or'hookproper of its said hook is inclined upward and outward at a less angle forming a hooking face, the edges c and Z forming a V- shaped 'notch whose apex is about coincident with the plane of the vertical edges f of thestandards d, that is, approximately vertically beneath the holes 71,. The catch or hook-proper is preferably rounded at the under side, as at m.

Member B includes a base-plate n and upstanding therefrom a hook 0 which rises from the outer portion of the top surface of the base-plate, which latter is adapted to be secured to the rail b by screws passed through suitable holes therein. The hook is fairly broad and its hook-proper projects inwardly. The catch shoulder or hookproper of this hook has an inner cam face g pitched inward and downward and also formed concave in substantial conformity with the convex face g of the standards Z of the member A, and an under hooking face r inclined inward and downward at a less angle, said faces giving the catch or hookproper a wedge shape in side elevation some- 100 what more acute than the V-notch of the pawl hook z'. Formed integrally with the base-plate n and hook o is a pair of spaced upstanding lateral walls or webs s which with the base-plate and hook form a housing 105 that is open only inwardly, the front edges t of these walls being vertical and so conforming with the vertical edges f ofthe standards d of member A.

As viewed in front elevation, Fig. 6, it 110 will be preferable to flare the top portion of the aforesaid housing, for apurpose to be explained.

.Assuming either sash to be closed, if the other be moved to closed position the pawl or lever will be cammed baclrby the face q of member B and having passed said face will'return to the normal position (Fig. 2) and interlock both sashes so that neither can be opened without moving the pawl so that its hook will again clear the hook of mem-- ber B. The handle j by its weight ofcourse holds the pawl in the locking position, and it affords means for readily releasing the pawl.

The device can not be tampered with byk im, plements entered between the sash rails from the outside, because the pawl is protected from manipulation in that way by the walls s, bythe devious form of the space formed by the opposed'inclined faces of the rails a" b and the faces f-z and g-g of the members A. B, and by the normal position of the apex of the notch in the pawl being not only coincident with ,said passage but vertically beneath the `axis of movement of said awl soy that even if a wire .or other implement were entered vbetween the rails' and then between the members ,A and B and made to catch on the pawla pull on such implement would thenv result in no movement of the` pawl The form and disposiv tion ofthe hook-proper of hook 0. and the notch of thevpawlwhen engaged with each other are suchthat the apex of the former engagesat vthe apex of the: latter and the point of engagement, isf vertically beneath the axis It of the pawl,so that a force ape plied to openone of the sashes when inter- ,tion7 what we claim as newA and desire to secureby Letters Patent is A ysash-lock including, in4 combinatiom ka pair of members adapted to be respectively secured on the top surfaces of the meeting y rails of two` sashes and arranged to face each other andform a narrow space betweeny them when said rails face each other,.a hook pendently pivotedy in the relatively inner member and having a V-shaped hook notch normally in substantially verticalcoincidence Awith its pivot and in substantial cof. incidence at its apex w1th`sa1d space when f said members are so arranged, the other.

member having an inwardly, lprojecting catch shoulder engaged by saidhoolcwhen Y `said members are so arranged.

n In testimony whereof we affix' our signav tures. f

' WILLIAM A. LAUFER.

ANDREW KUFTA. 

